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The GBA/PSP/iOS remakes include Ultima Weapon as an optional boss. It is a palette swap of a Behemoth sprite and proves to be a difficult boss. It can be found in the Soul of Rebirth dungeon, in an area that consists in a replica of the last floors of the Mysidian Tower. Defeating it grants the player the Ultima spell.

Both the Weapons are simple palette swaps of each other, apart from that Ultima Weapon wields a sword. It follows both the quadruped and upright trends set by Final Fantasy VI and VII by making the Weapon resemble a centaur-like monster.

Both the Ultima Weapon and the Omega Weapon can be fought in the Omega Ruins. Nemesis is one of the toughest battles in the game and is an original creation from the Monster Arena. Ultima Buster also exists in the original creation from the Monster Arena, and while not named a weapon, it shares its name from Ultima Weapon.

The "Twin Weapons" trend set by Final Fantasy VIII returns along with its six-limbed style.

Ultima and Omega also appear as bosses in the Chains of Promathia expansion, classified as Biotechnological Weapons. While Omega is reminiscent of the robot Omega from Final Fantasy V, Ultima looks completely different than any other incarnation, appearing as floating, almost insectoid machine.

Two other genera of Weapon enemies are exclusive to this title: the Animated Weapon and Evil Weapon. The first is composed by literal animated Weapons, the second is a more mystical genus of enemies.

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The Ultima Weapon appears as the final boss of the original Main Scenario storyline of A Realm Reborn. It is an ancient anti-Primal superweapon that was buried for several centuries before the Garlean expeditionary forces under Gaius van Baelsar unearthed it to be used in their campaign against the Grand Companies of Eorzea. Its defeat triggers the ending cinematic and the completion of the Main Scenario storyline.

Omega is mentioned during the Defenders of Eorzea storyline as an Allagan war machine much like the Ultima Weapon that was unearthed in the Carteneau Flats following the Calamity. The Syndicate member Teledji Adeledji plots to seize Omega for himself and use its power to take control of Ul'dah, if not all of Eorzea.

Two Magick Weapons can be fought in the game. They are named Upsilon which, like Omega, is a letter of the Greek alphabet. The first is fought near Goug as part of the Heritor quest sequence, and the second subsequently appears in the Aldanna Range during the quest "Wanted: Magick Weapon". After defeating the second Upsilon, the player can read three pub notices, which are "Research Notes". These reveal that the Upsilons were actually based on the design schematics for the infamous Omega Mark XII.

The unnamed creator was possibly a moogle, since the Upsilons are strongly implied to have been built in Goug. In a possible reference to the game itself, the notes state that the creator called the two later models "Upsilon A2" and "Upsilon A3". It also transpires that while Omega Mark XII was powered by Mist, the three Upsilons were built to utilize lava, snow and seawater respectively (with a substantial degree of success).

While the second set of notes suggests that the player can fight the third Upsilon, it would seem that Upsilon A3's intake system was rather too efficient, as the final set of notes reveals that it went wild and exploded due to taking in too much water.

The weapons take their appearance from Final Fantasy XII, except for an additional two legs.

The Saint Weapon and Black Buster is the holy form and dark form of the Icedrake-class dragons. The sprite of the Saint Weapon and Black Buster are modified versions of Ultima Weapon/Ultima Buster from Final Fantasy VI.